[Windows] Feature request: allow collecting mount point data without Administrator access in disk_partitions()

[KSerrania]

Summary

• OS: Windows
• Type: core

Description

#1192 added the ability for psutil.disk_partitions() to list mount points on Windows, using the FindFirstVolumeMountPoint, FindNextVolumeMountPoint and FindVolumeMountPointClose functions.

These functions' required permissions aren't well-documented (see FindFirstVolumeMountPoint and FindNextVolumeMountPoint), but experimentally it seems like these two functions only work if the caller has Administrator access on the host. Otherwise, these functions return an OSError 5 (Access is denied), which means they won't appear in the output of psutil.disk_partitions().

For instance, on a Windows Server 2012R2 instance where I added two mount points in the D: drive, I get the following as Administrator:

> python.exe -c "import psutil; print('psutil version', psutil.__version__); print(*psutil.disk_partitions(all=True), sep='\n')"
psutil version 5.7.2
sdiskpart(device='C:\\', mountpoint='C:\\', fstype='NTFS', opts='rw,fixed')
sdiskpart(device='D:\\', mountpoint='D:\\Data\\', fstype='NTFS', opts='rw')
sdiskpart(device='D:\\', mountpoint='D:\\tempdb\\', fstype='NTFS', opts='rw')
sdiskpart(device='D:\\', mountpoint='D:\\', fstype='NTFS', opts='rw,fixed')
sdiskpart(device='E:\\', mountpoint='E:\\', fstype='', opts='cdrom')

and the following as a non-Administrator user:

> python.exe -c "import psutil; print('psutil version', psutil.__version__); print(*psutil.disk_partitions(all=True), sep='\n')"
psutil version 5.7.2
sdiskpart(device='C:\\', mountpoint='C:\\', fstype='NTFS', opts='rw,fixed')
sdiskpart(device='D:\\', mountpoint='D:\\', fstype='NTFS', opts='rw,fixed')
sdiskpart(device='E:\\', mountpoint='E:\\', fstype='', opts='cdrom')

Could there be a way for psutil.disk_partitions() to be able to list mount points even when the user does not have Administrator rights?